HAWKUNG10Pcs 3D Printer Filament Vacuum Compression Reusable Storage Bags with Manual Air Pump for Filament Storage, Compress and Remove Air to Prevent Humidity in Filament, 30x34cm

I saw some bad reviews of these and compared to my experience they are unfair.You do need to lay the part of the bag that you push the pump up against flat on a hard surface. That's not a bad thing, it's how they work.All of my reels fit inside, they come with a load of those gel bag things and you can suck nearly all of the air out of them easily.What more could you want from them?

Jus the right size for a standard 1Kg filament reel the vac seal can be a little temperamental to get going but once air vacuumed out it holds well. The pump is what you would expect and needs a flat surface to work from. Good value

This actually works really well. I was a bit confused that you just place the nozzle over the sticker on the bag and don't peel anything off, but after a few pumps the bag shrinks up brilliantly and holds the seal really well. Such a strong vacuum that it actually can bend the plastic of the spool, so be careful!

When buying rolls of filament and not using it all in one go is wasting your money thease vacume bags are ideal and at the right price to keep your filament dry and in good condition it's like opening a new Bach of filament every time you use them

When you use the pump it seems like it can't possibly work, but having read another review I persisted and it worked perfectly. So for half a dozen pumps it seems like you're wasting your time, then it suddenly kicks in and everything is fine.

Absolutely useless, the valve wouldn't allow air to be sucked from the bag. Fabric was too light causing the opposite side to seal against the valve.Returned for a refund.

These vacuum bags are a must for 3D printers. If you want to have quality prints time after time you want to make sure that moisture does not get into your filament. These vacuum bags seal out moisture so that your filament rolls stay fresh without having to go through the long and annoying process of drying wet filament.Each bag more than comfortably holds a 1kg spool of filament and while it can be a little tricky to get started, they hold a seal very well. I put a bag of desiccant in the middle of the spool to help eliminate any moisture, then seal the bag. You definitely want to use rapid pumps to draw all the air out, and it may take a bit for the pump to get a good seal. However, with a little effort you will get a good seal that will keep moisture out of your filament. The bags compress down enough that your filament roll can fit back in a typical filament box, or you can clearly see the filament through the bags. All in all this is a great product that does exactly what it advertises.

I got these to store other things as it says that you can like herbs coffee beans ect, the air is pulled out brilliant but the bags are not so vacuum packed just a few hrs later so I feel the seals are not the best. I have tried 3 bags and keep persisiting since Friday but have had to pump air out every day so far. Feel the bags may be faulty and can't find out how to message the seller as yet